28238656 has 14 divisors (see below), whose sum is σ = 56036210. Its totient is φ = 14119296.

The previous prime is 28238653. The next prime is 28238671. The reversal of 28238656 is 65683282.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 12110400 = 4016^2 + 3480^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28238653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220551 + ... + 220678.

Almost surely, 2^28238656 is an apocalyptic number.

It is an amenable number.

28238656 is a deficient number, since it is larger than the sum of its proper divisors (27797554).

28238656 is an equidigital number, since it uses as much as digits as its factorization.

28238656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441241 (or 441231 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 28238656 is about 5314.0056454618. The cubic root of 28238656 is about 304.5191958728.

The spelling of 28238656 in words is "twenty-eight million, two hundred thirty-eight thousand, six hundred fifty-six".